Method for effectively broadcasting period information based on traffic flow density and cross-layer information

The invention discloses a method for effectively broadcasting period information based on traffic flow density and cross-layer information. The method comprises the following steps: detecting traffic flow density rho (pcu/m); under n period broadcast time intervals, summarizing related information sending states of a MAC layer and a PHY layer; and according to the traffic flow density and the related information sending states of the MAC layer and the PHY layer, dynamically adjusting sending power of a vehicle itself to control effective sending distance of a vehicle node, thereby realizing effective sending of period broadcast information. The information sending power is adjusted dynamically according to the traffic flow density and the cross-layer information, and furthermore, the sending distance of the period broadcast information is adjusted, so that under the condition of high traffic flow density, the information sending power is reduced, and under the condition of low traffic flow density, the inform